From the author of 'Little Women', this romantic mystery follows the young Lillian Trevlyn whose father died under mysterious circumstances before she was born. Twelve years after his death, Lillian meets an orphaned boy Paul who applies to work on the estate. Though warmly welcomed by Lillian's family, Paul is secretive about his past and his plans for the future. Does Paul know anything about the unsolved death of Lillian's father all those years ago? The suspense reaches a climax when Paul suddenly goes missing. 'The Mysterious Key and What it Opened' is one of Louisa May Alcott's hidden gems, full of mysterious as well as heart-warming moments.